Filter.



PATENTED AUG. 28,-1906. o. SELLBNSOHEIDT.

FILTER.

APPLICATION FILED JUNE 9. 1904.

v -contain two filtering-walls a with an inter-- whereby UNITED STATES PATENT OFFICE.-

CARL SELLENSOHEIDT, OF BERLIN,

GERMANY, ASSIGNOR TO FILTER &

'BRAUTECHNISCHEN MASCHINEN-FABRIK AKT. GES. VORMALS L. A.

ENZINGER, or BERLIN,

GERMANY.

FILTER.

Application filed June 9, 1904. Serial No. 211,747.

of construction and arrangement of parts of the filtering-walls and associated apparatus the number of parts is decreased to a minimum and the facility of manipulation and the general efficiency of the device is greatly enhanced. 3

In the accompanying drawin s, Figure 1 is a section view of two adjacent ter elements embodying my invention, and Fig. 2 is a modification. q 7

Each element comprises a tubular casing 0, formed in the usual manner to interlock with others similarly formed, and is adapted to mediate space or chamber between them. The casing is also appropriately bored or provided with passages for the introduction of the fluid to be filtered into this chamber and for the Withdrawal of the filtered fluid in the manner familiar in' the art. The direction of travel of the fiuid through each element is clearly indicated by the arrows.

The filtering-walls a are each composed'of pasteboard-like fibrous material pressed'between two perforated lates 'b, the perforations '6 whereof are su stantially conical or tapered, with their larger openings disposed inwardlyor toward the filtering layer. The inner plates of the walls are supported in annular recesses on opposite sides of the central rib d of the casin and the outer plates are mounted on ring-frames e, fitted to slide within the casing. The filtering. material is .com ressed by pushing the movable plate to: war I the other by means of apparatus not shown, and the conical perforations b, become filled with the more or less plastic filtering material, so that the fibrous wall possesses conical protuberances projecting into the plates on either side, in this manner presenting a sufficiently large filtering area to the liquidto be filtered and at affording adequate support for the material Without having to resort to sieves or other interposed means to keep such fibers as may Specification of Letters Patent.

the same time Patented Aug. 28,1906.

liquid.

tage that the filtering layers during transport of the plates and when the elements in the press are arranged vertically together do not ulge and at the upper edge betweerifiltering layer and frame allow too easy passage of the liquid. At their inner or larger ends the perforations are preferably so close to gether as to give the appearance of a grid, while upon the outer side they appear as very e holes. p

The filter elements are each provided with movable plates against the, pressure of the compressed material at any. distance from the corresponding fixed plates to which they may have been moved by the compressing act, and my invention contemplates a wide variety of mechanical forms for the embodiment of this holding or locking means. For eXample',-the said means ,t ionalengagement with the casing .or by toothed engagement therewith, and it may also be automatic in its action, if desired, so long as it serves to lock andhold the said plate at any oint in its range. of traverse within the casing. I find those retaining devices to be preferable which are not in the way during the compressing act and may be readily applied subsequently. As shown herein at f, the device consists of a shaft m, which is cylindrical and is slidingly mounted within a channelin the casing, the channel being inclined to the direction of the pressure of the filtering material. The shaft is provided with a head which overlaps the frame 6 of the movable plate, so that the outward.

of the shaft within its channel, which effectually prevents its displacement therefrom or the removal of the plate. preferably provided with recessesto constitute seats for the heads, and the heads or the seats, or'both, are inclined where they are in engagement to exert a lateral pressure on the shafts, thereby facilitating the binding effect above referred to. Pressure applied in the direction of the axis ofsaid shaft m will readily release the same, and any desired number of the devices may be used upon a single plate.

I break loose from passing through with the This constructionhas the further advanpressure of the latter causes a severe binding The frame 6 is By means of the apparatus above declutching or retaining means for holdin the 75 may operate by fric- -ically-perforated plates 6 filtering material 0. lies, are not secured to the walls a.

scribed and embodying my invention the density of the filtering layers may be ren dered uniform and the workman is relieved of the necessity of carefulor even ap roximate measurement of'the amounts of brous material. The operationbf setting up the apparatus is simplified and various other ad vantages which will not require indication are secured.

Referring to the modification shown in Fig. 2, the dense pasteboard-like wall a is contained in a frame a, as before, but the conbetween which the frame 6, but are carried by adjacent frames 1), each constituting a kind of grid or sieve. Each frame 6 is provided Wth two conicallyperforated plates b I), having an inlet or outlet chamber for the liquid betweenthem. The larger end of the conical perforations of these plates is presented to the filtering material a, and the plates press closely against the filtering material on either side, so that when the filter elements are pressed together that is to say, when the entire filter ing apparatus is screwed upthe perforated plates are forced into the pasty filtering- The action is then just the same as when (in the case of the apparatus shown in Fig. 1) the filtering material is broughtto pasteb'oard like consistency between the plates 7) b in'the press, except that in the present case the pastymass is not forced so far into the conical perforations. It will be found convenient to cast one of the erfo' rated plates-for instance, b -lI1l'/0 the ame I), while the other, 11*, is simply inserted into an annular recess in the frame I) and held there-by anysuitable'means;

Having described my invention, what I claim, and desire to secure by United States Letters Patent, isv 1. In a paratus of the class described, a number 0 filter elements. each com osed of a tubular casing, relatively movab e perforated plates contained in said casing and form nga s ace between them for the filtering materia in combination with automatic clutching means for retaining said lates au tomatically in the positions to which they have been pressed.

2. A filter element comprising a tubular casing and a pair of relatively movable perforated plates therein providing a space between the tn for the filterin material, in com bination *ith a retainin with the side wall of sai tubular casing an with one of said plates to lock the same to the casing at any its traverse therein.

' devices serving to hold said movableany desired position with respect to t evice cooperating desired point in the range of A filter element comprising a tubular casing with an inward projection, a perforated plate supported thereagainst and a movable perforatedtplate providing an intermediate space to contain filtering material, in combination with a retaining device located in the sidewallof the casing to loclr the plate at I any desired point in the range of its traverse therein.

4. -A filter element comprising a tubular casing having an inwardly-projecting rib, perforated plates supported on opposite sides thereof forming an intermediate iluidchani her, and movable perforated plates coperating with said fixed lates respectively to provide spaces for the ltering material, and

automatic clutchingmeans cooperating with the side wall of the casing for holding said movable plates'at variable distances from their corres ending fixed plates.

5; Inaf ter element, a casing, perforated fixed and'movable plates located therein, filtering material pressed between said plates and retaining devices having shafts adapted to slide ,in,'channels inclined to the direction of outward and heads overlapping said movable. plate whereby said movable plate may be locked at variable distances from said fixed plate.

6. In combination, a casing for containing ressed. filtering material, a movable plate earingagainst'the same and a retaining de .vice for-said plate having a shaft adapted to i to the lide in a channel in the casing incline direction of pressure of said pressed material and a head overlapping said p ate, the con tact rea of head and facilitate thebinding of the shaft within its channel.

' 7. The-combination in a filter element of a pressure 7 of said'pressed material platebeing inclinedto' plate orlplates provided Wth a plurality of tapered openings, wi th' a filtering material of fibrous or like substance pressed into the larger ends ofsaid tapered openings.

8. In a filter element, the combination of fixed and movable plates provided with ta pered-gerforations having their larger apervtures I isposed inwardly, filternigmaterial pressed between said plates and retiiining ate in plate.

In'testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

CARL SELLENSCHEIDT.

Witnesses:

Hans HEIMANN, HENRY HASPER. 

